+------------------+
| Model files: PHP |
+------------------+

Location: /PhotoSite/model/php

Filename:   connect.php
-----------------------
Purpose:    Connect to the database and establish a database handler

Filename:   userFunctions.php
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Purpose:    Aggregate all user functions focused on login and registration
Features:   1) Functions to validate usernames, usernames/passwords
            2) Function to insert new users into photo_users table
            3) Uses SHA-1 encryption and salt to generate passwords
            
Filename:   photoFunctions.php
------------------------------
Purpose:    Aggregate all DB functions related to photos
Features:   1) Function to insert a photo, which must perform the insert, then
               use the new file_id to insert any hashtag records associated with
               that photo.
            2) Registration of here-to-fore unseen tags into photo_tags
            3) ...and many more!
            
Filename:   tagFunctions.php
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Purpose:    Aggregate all DB functions related to tags
Features:   1) Performs a JSON encode of the results from the database queries